Grundfos PM 1 User Manual

English (GB)
16
15.2 Fault finding, PM 2
Fault Cause Remedy
1. The green light
field for "0 bar"
is off even if the
power supply
has been
switched on.
a) The fuses in the electric
installation have blown.
Replace the fuses. If the new fuses also blow,
check the electric installation.
b) The earth leakage circuit breaker
or the voltage-operated circuit
breaker has tripped out.
Cut in the circuit breaker.
c) No power supply. Contact the power supply authorities.
d) The pressure manager is
defective.
Repair or replace the pressure manager.*
2. The green
"Pump on"
indicator light is
on, but the pump
does not start.
a) The power supply to the pump
has been disconnected.pressure
manager.
Check the plug and cable connections, and
make sure the built-in circuit breaker of the
pump is switched off.
b) The motor protection of the pump
has tripped out due to overload.
Check if the motor or pump is blocked. If so,
remove the blockage.
c) The pump is defective. Repair or replace the pump.
d) The pressure manager is
defective.
Repair or replace the pressure manager.*
3. The pump does
not start when
water is
consumed.
"Pump on" is off.
a) Too big difference in height
between the pressure manager
and the tapping point.
Adjust the installation, or increase the start
pressure.
See section 4.2.1 DIP switches, PM 2.
b) The pressure manager is
defective.
Repair or replace the pressure manager.*
4. System without
pressure tank:
Frequent starts
and stops.
a) DIP switch 5 is set to "ON". Set DIP switch 5 to "OFF".
See section 4.2.1 DIP switches, PM 2.
b) Leakage in the pipework. Check and repair the pipework.
c) The non-return valve is stuck in
open position.
Clean or replace the non-return valve.*
5. System with
pressure tank:
Frequent starts
and stops.
a) The pressure tank has no
precharge pressure, or the tank
size is insufficient.
Check the tank precharge pressure, and
recharge the tank, if necessary.
If the size of the pressure tank is insufficient,
set DIP switch 5 to "OFF", or replace the
pressure tank.
b) Leaky non-return valve. Clean or replace the non-return valve.*
6. The pump does
not stop.
a) The pump cannot deliver the
necessary outlet pressure.
Replace the pump.
b) The start pressure is set too
high.
Reduce the start pressure.
c) The pressure manager is
defective.
Repair or replace the pressure manager.*
d) The non-return valve is stuck in
open position.
Clean or replace the non-return valve.*
7. The red "Alarm"
indicator light is
permanently on.
a) Dry running. The pump needs
water.
Check and repair the pipework.
b) The power supply to the pump
has been disconnected.
Check the plug and cable connections, and
make sure the built-in circuit breaker of the
pump is switched off.
c) The motor protection of the pump
has tripped out due to overload.
Check if the motor or pump is blocked. if so,
remove the blockage.
d) The pump is defective. Repair or replace the pump.
e) The pressure manager is
defective.
Repair or replace the pressure manager.*

Grundfos PM 1 Specifications

General

Brand	Grundfos
Model	PM 1
Category	Controller
Language	English